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WO2005050237A1 - Bobinage hybride transverse electromagnetique/cage d'oiseaux pour irm - Google Patents

Bobinage hybride transverse electromagnetique/cage d'oiseaux pour irm Download PDF

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Publication number
WO2005050237A1
WO2005050237A1 PCT/IB2004/052290 IB2004052290W WO2005050237A1 WO 2005050237 A1 WO2005050237 A1 WO 2005050237A1 IB 2004052290 W IB2004052290 W IB 2004052290W WO 2005050237 A1 WO2005050237 A1 WO 2005050237A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
birdcage
radio frequency
tem
spaced apart
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2004/052290
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English (en)
Inventor
Christoph G. Leussler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
US Philips Corp
Original Assignee
Koninklijke Philips Electronics NV
US Philips Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV, US Philips Corp filed Critical Koninklijke Philips Electronics NV
Priority to JP2006540676A priority Critical patent/JP2007511315A/ja
Priority to EP04799055A priority patent/EP1687651A1/fr
Priority to US10/595,861 priority patent/US7345481B2/en
Publication of WO2005050237A1 publication Critical patent/WO2005050237A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils

Definitions

  • HYBRID TEM/BIRDCAGE COIL FOR MRI DESCRIPTION The following relates to the magnetic resonance arts. It finds particular application in magnetic resonance imaging, and will be described with particular reference thereto. However, it also finds application in magnetic resonance spectroscopy and other magnetic resonance applications.
  • Two types of radio frequency coils commonly used in magnetic resonance imaging are birdcage coils and transverse electromagnetic (TEM) coils. Each type of coil has certain advantages and disadvantages.
  • Birdcage coils include a plurality of parallel spaced apart conductors (sometimes called "rungs") on the surface of a cylinder and end conductors in the form of an end cap and a ring or a pair of end rings transverse to the rungs.
  • the resonance modes of these coils are typically a single whole volume resonator with current flowing rung-to-rung.
  • Birdcage coils can have a substantially open geometry that does not produce claustrophobic effects on human imaging subjects, thus promoting patient comfort. Birdcage coils also exhibit good radio frequency properties, such as high quality factors, for frequencies of about 128 MHz or lower, corresponding to proton resonance in main (B 0 ) magnetic fields of about 3T or lower. However, for higher frequencies corresponding to B 0 >3T birdcage coil performance is increasingly limited by strong coupling with imaging subject tissue and radiative losses of the radio frequency energy.
  • TEM coils include a plurality of parallel spaced apart conductors (sometimes called "rungs") and a coupled cylindrical radio frequency screen providing current return paths.
  • Resonance modes of TEM coils are typically rung-to-screen, although some rung-to-rung resonance modes may also be supported.
  • the radio frequency screen is typically a metal mesh or conductive foil.
  • TEM coils typically provide improved radio frequency performance compared with birdcage coils for higher frequencies corresponding to B 0 >3T due at least to radiative loss reductions provided by the screen.
  • TEM head coils or whole-body coils have the disadvantage of enclosing the head or the entire imaging subject, respectively, within the cylindrical radio frequency screen. Human imaging subjects sometimes find such confined enclosure be claustrophobic.
  • a problem common to both birdcage and TEM coils is their fixed diameter, which is determined by the diameter of the rings in the case of a birdcage coil, and by the diameter of the cylindrical radio frequency screen in the case of a TEM coil.
  • a coil approximately sized to match the imaging subject improves radio frequency coupling with the imaging subject, allowing the input radio frequency power to be reduced.
  • the cylindrical whole-body birdcage or TEM coil typically surrounds the patient bridge, or other components, which can complicate removal and insertion of different coils.
  • the present invention contemplates a new and improved method and apparatus which overcomes the above-referenced problem and others.
  • a radio frequency coil for a magnetic resonance imaging system, including a birdcage section and a TEM section.
  • the birdcage section includes a plurality of parallel spaced apart conductors and one or more end conductors aligned generally transverse to the spaced apart conductors.
  • the birdcage section resonates at, a birdcage resonant frequency.
  • the TEM section includes a plurality of parallel spaced apart conductors and a radio frequency screen.
  • the TEM section resonates at a TEM resonant frequency.
  • the birdcage section and the TEM section are relatively disposed with the parallel spaced apart conductors of each section aligned.
  • the birdcage section and the TEM section cooperatively define a subject receiving region.
  • a magnetic resonance imaging scanner including a birdcage section and a TEM section encompasses a subject receiving region.
  • a magnet generates a temporally constant main magnetic field through the subject receiving region.
  • a plurality of magnetic field gradient coils are arranged to produce magnetic field gradients across the main magnetic field in the subject receiving region.
  • the birdcage section of the radio frequency coil includes a plurality of parallel spaced apart conductors and one or more end conductors aligned generally transverse to the spaced apart conductors.
  • the birdcage section resonates at a birdcage resonant frequency.
  • the TEM section of the radio frequency coil includes a plurality of parallel spaced apart conductors and a radio frequency screen.
  • the TEM section resonates at a TEM resonant frequency.
  • the birdcage section and the TEM section are relatively disposed with the parallel spaced apart conductors of each section aligned.
  • the birdcage section and the TEM section cooperatively define the subject receiving region.
  • a radio frequency coil is disclosed.
  • a birdcage section includes a plurality of parallel spaced apart conductors and one or more cross conductors disposed generally transverse to the spaced apart conductors.
  • a TEM radio frequency screen section includes a radio frequency screen coupled with the birdcage section and having openings corresponding to spacings of the spaced apart conductors, and transparent or translucent dielectric material disposed in the openings of the radio frequency screen.
  • the transparent or translucent dielectric material allows an associated imaging subject disposed inside the coil to see through the radio frequency coil.
  • One advantage resides in combining high patient visibility afforded by the relatively open birdcage configuration with improved high radio frequency characteristics afforded by the TEM coil configuration.
  • Another advantage resides in providing a removable, relatively open birdcage section that is swappable with at least one other coil section appropriate to a selected imaging procedure.
  • Yet another advantage resides in providing an asymmetric radio frequency coil having a generally planar TEM section integrated with the subject bridge and an arcuate birdcage portion.
  • Still yet another advantage resides in providing a coil that can be operated either as a volume resonator or as a phased coil array for parallel imaging, SENSE imaging, or the like.
  • FIGURE 1 diagrammatically shows an end view of a magnetic resonance imaging scanner incorporating a radio frequency coil having a generally planar TEM section and an arcuate birdcage section.
  • FIGURE 2 diagrammatically shows a side view of the magnetic resonance imaging scanner of FIGURE 1, in which about one-half of the scanner is cut away to show internal features.
  • a movable couch for transporting an imaging subject into the scanner bore is also shown in FIGURE 2.
  • FIGURE 3 shows an electrical schematic of coupling of the TEM and birdcage sections to define a volume resonator.
  • FIGURE 4 shows an electrical schematic of another approach for coupling of the TEM and birdcage sections to define a volume resonator.
  • FIGURE 5 shows an end view of a generally cylindrical radio frequency coil having coupled TEM and birdcage sections.
  • FIGURE 5 also shows suitable port connections for driving the coil as a volume resonator.
  • FIGURE 6 shows a method for selectively coupling or decoupling individual conductors or rungs of a radio frequency coil having birdcage and TEM sections, and driving electronics for operating the selectively coupled and decoupled rungs as a phased coils array.
  • FIGURES 7A, 7B, 7C, and 7D show electrical schematics of several phased coils array configurations obtained by selectively defining sub-coils through the selective coupling and decoupling of conductors or rungs of a radio frequency coil having birdcage and TEM sections.
  • FIGURE 8 diagrammatically shows an end view of a magnetic resonance imaging scanner inco orating a radio frequency coil having a generally planar TEM section and an arcuate birdcage section, in which an outer shielding radio frequency screen also serves as the radio frequency screen of the TEM section of the coil.
  • FIGURE 9 diagrammatically shows an end view of a magnetic resonance imaging scanner incorporating a radio frequency coil having a generally planar TEM section and two swappable arcuate birdcage sections of different sizes.
  • FIGURE 10 diagrammatically shows three radio frequency coils of different sizes each having a generally planar TEM section and an arcuate birdcage section.
  • the three radio frequency coils are arranged at different positions along the axis of the magnet bore to image the head, torso, and legs, respectively, of a prone human imaging subject.
  • FIGURES 11 and 12 diagrammatically show radio frequency head coil embodiments each having a TEM section and a birdcage section.
  • FIGURE 13 diagrammatically shows a "rolled out" view of a radio frequency coil having a birdcage configuration and a relatively open radio frequency screen.
  • a magnetic resonance scanner 10 includes a main housing 12 that houses or support at least main magnetic field coils 14 and magnetic field gradient coils 16.
  • the main magnetic field coils 14 generate a mainB 0 field along a magnet bore 18 defined by the housing 12, while the magnetic field gradient coils 16 produce selected magnetic field gradients within the magnet bore 18.
  • a shielding radio frequency screen approximately coextensive with the magnet bore 18 includes a generally planar bottom portion 22 and an arcuate upper portion 24.
  • a subject bridge 26 extends through the bore 18 and is disposed above the generally planar bottom portion 22 of the shielding radio frequency screen.
  • the shielding radio frequency screen is cylindrical.
  • a radio frequency coil 30 includes a generally planar bottom transverse electromagnetic (TEM) section 32 and an arcuate upper birdcage section 34 together encompassing a subject receiving region.
  • TEM transverse electromagnetic
  • the TEM section 32 includes a plurality of conductors or rungs 40 and a radio frequency screen 42 capacitively coupled to the rungs 40 (couplings indicated in FIGURE 1).
  • the birdcage section 34 includes a plurality of conductors or rungs 46 and transverse end members 48 in the form of arcuate partial rings or an arcuate end cap at one end and an arcuate ring at the other defining the arcuate cross-section of the birdcage section 34.
  • the longitudinal conductors 40, 46 and the conductive transverse cross members 48 can be, for example, conductive rods, copper traces formed on or in a printed circuit board, or the like.
  • Capacitances in the conductors 40, 46 and the transverse cross members 48 are preferably distributed along the conductive rods, copper traces, or the like, or can be discrete capacitors mounted on a printed circuit board and coupled with the conductors as a hybrid circuit.
  • An imaging subject 50 is moved into the magnet bore 18 and inside the the coil sections 32, 34 using a movable pallet 54 supporting the imaging subject 50, which is pushed, pulled, or otherwise moved along a top supporting surface the subject bridge 26.
  • the rungs 40 of the TEM section 32 are disposed in slots 56 defined in the underside of the subject bridge 26. Thus, the subject is disposed relatively close to the TEM section 32.
  • FIGURE 3 shows an electrical schematic of connecting portions of the birdcage section 34 and the TEM section 32
  • the coil sections 32, 34 are optionally capacitively connected by capacitances 60 to form a volume resonator.
  • the coupling capacitances 60 are represented in FIGURE 3 by capacitances C K ; the rungs 46 and crossing members 48 of the birdcage section 34 include capacitances C and Cr, respectively; and the rungs 40 and radio frequency screen 42 of the TEM section 32 include capacitances O ⁇ and Co, respectively.
  • the two sections 32, 34 can also be coupled by an inductive transformers 62 as indicated in FIGURE 3 to form a volume resonator.
  • the coupling capacitances CK 60 are optionally omitted.
  • coupling using the inductive transformers 62 does not involve galvanic connections between the coil sections 32, 34.
  • a coaxial half- wave cable (not shown) is used for coupling the sections (32, 34) to define a volume resonator.
  • the two sections 32, 34 are coupled by spatially overlapping the ends of the birdcage and TEM sections 32, 34. The approach, also has the advantage of not involving galvanic connections between the coil sections 32,- 34.
  • Coupling between the sections 32; 34 is principally due to inductive coupling between rungs 46 of the birdcage section 34 that overlap the radio frequency screen 42 of the TEM section 32, as indicated in FIGURE 4.
  • the couplings at the two ends are preferably symmetric so that the volume resonator has a bilateral symmetry about a plane of symmetry 66.
  • the TEM section 32 and the birdcage section 34 resonate at a common volume resonance frequency.
  • the impedances or other characteristics of the couplings 60, 62 between the two sections 32, 34 are selected to ensure resonance at the common volume resonance frequency.
  • a slightly modified radio frequency coil 30' has a curved elliptical or circular, rather than flat, TEM section 32' including conductors or rungs 40'.
  • the resonator is driven using separate transmit/receive or send/receive (S/R) channels, specifically four S/R channels 70, 72, 74, 76 in the example of FIGURE 5.
  • S/R transmit/receive or send/receive
  • each conductor 46 of the birdcage section 34 and each conductor 40 of the TEM section 32' is separately driven by a dedicated send/receive channel. This allows individual conductors 40, 46 to be mutually coupled or decoupled to control homogeneity and signal-to-noise ratio.
  • FIGURE 6 Similar driving arrangements can be used for the coil 30 of FIGURES 1 and 2 when coil 30 has sections 32, 34 interconnected to define a volume resonator.
  • selectable decoupling of conductors or rungs 40, 46 is provided to define a volume resonator or a selected phased array of sub-coils for use in parallel imaging modalities such as SENSE imaging.
  • decoupling of selected conductors 40, 46 is suitably accomplished by connecting each conductor via coaxial or other shielded cabling 80 to a remote impedance network 82.
  • Each sub-coil is individually driven by a dedicated send/receive channel 84.
  • phase-shifting impedances such as phase shifting capacitances can be arranged between sub-coils to provide selected decouplings defining the phased array.
  • phase-shifting impedances such as phase shifting capacitances can be arranged between sub-coils to provide selected decouplings defining the phased array.
  • active coupling/decoupling as described with reference to FIGURE 6
  • passive decoupling using decoupling capacitors one or both of the TEM section 32 and the birdcage section 34 can be operated as a phased coil array defined by sub-coils each made up of one or more of the conductors 40, 46.
  • decoupling impedances or of independent radio frequency driving signals for desired decouplings of the various conductors 40, 46 is described in Leussler, WO/02/095435 Al, published Nov. 28, 2002.
  • different coil or sub-coil array configurations can be used for the radio frequency transmit and receive phases of the magnetic resonance imaging.
  • FIGURE 7A a decoupled bandpass section is formed using a dedicated capacitor ratio of conductor 46 or crossing member 48 capacitors.
  • inductive decoupling is achieved by selected overlap of sub-coils, or by including inductive transformers similar to the transformers 62 of FIGURE 3.
  • FIGURE 7C shows a mixture of inductive and capacitive decoupling of individual sub-coils.
  • FIGURE 7D shows decoupling of bandpass networks formed by the birdcage conductors 46 and the transverse crossing members 48, in which the bandpass networks are decoupled from one another using additional ring conductors 48' with decoupling capacitances and C 2 .
  • FIGURE 8 shows a modified embodiment 10" of a magnetic resonance imaging scanner including a modified radio frequency coil 30", in which the lower shielding radio frequency screen 22 of the scanner 10 of FIGURE 1 is modified to form a lower radio frequency screen portion 22" which also serves as the radio frequency screen of a modified TEM section 32".
  • the conductors or rungs 40 of the modified TEM section 32" are capacitively coupled to the shielding radio frequency screen portion 22" so that the radio frequency screen portion 22" acts both as an active component of the TEM section 32" and as a shield for blocking stray radio frequency signals from interfering with other components of the scanner 10".
  • the separate TEM radio frequency screen 42 is omitted, thus providing more space inside the magnet bore.
  • the arcuate birdcage section is selected from a plurality of arcuate birdcage sections of different arc.
  • FIGURE 9 shows the radio frequency coil 10 of FIGURE 1 with the birdcage section 34 electrically uncoupled from the TEM section 32.
  • the birdcage section 34 is replaced by a birdcage section 34'" formed of conductors or rungs 46'" and crossing members 48'" having a different arc.
  • the replacement birdcage section 34'" has a different arc compared with the birdcage section 34 which places the birdcage section 34'" closer to the imaging subject 50 compared with the birdcage section 34.
  • the closer arc of the replacement birdcage section 34'" may be advantageous for imaging a smaller imaging subject, as it provides stronger radio frequency signal coupling therewith. While two swappable birdcage sections 34, 34'" are illustrated in FIGURE 9, additional swappable birdcage sections having other arcs or other characteristics can also be provided.
  • a swappable birdcage section can include unevenly spaced rungs to provide meshes of different sizes.
  • the TEM section 32 is mechanically integrated with the subject bridge 26 and is not removed when swapping the birdcage sections 34, 34'".
  • different capacitive or inductive coupling elements maybe used for coupling each swappable birdcage section 34, 34'" with the TEM section 32 to achieve the desired common volume resonance.
  • the arcuate birdcage sections 34, 34'" can have various cross-sectional shapes, such as having an elliptic shape or an asymmetric shape.
  • swappable birdcage sections may include ports for coupling with the impedance network 82 to provide actively selected sub-coil arrays, while other swappable birdcage section may include fixed passive decoupling impedances or may be designed without decoupling elements for use as volume resonators.
  • a plurality of radio frequency coils 90, 92, 94 each having a birdcage section 100, 102, 104 and a TEM section 110, 112, 114 defining a coil bore are arranged along the magnet bore 18 (indicated by dotted lines in FIGURE 10). Use of a plurality of coils arranged along the axis of the bore 18 allows each coil to be optimized for a particular imaging region of interest.
  • the coil 90 is sized to match a head region of a prone human imaging subject
  • the coil 92 is sized to match the torso region of the prone human imaging subject
  • the coil 94 is sized to match the legs region of the prone human imaging subject.
  • Each coil 90, 92, 94 can be connected to one or more dedicated transmit/receive magnetic resonance spectrometers for specific imaging applications.
  • a human head 118 is illustrated disposed inside a dedicated head radio frequency coil 120 that includes a birdcage section 122 and a TEM section 124.
  • the birdcage section 122 includes parallel spaced apart conductors or rungs 130 and transverse cross members 132 (indicated diagrammatically in FIGURE 11).
  • the TEM section 124 includes parallel spaced apart conductors or rungs 140 and a radio frequency screen having a first screen portion 142 disposed adjacent the parallel spaced apart conductors or rungs 140 and an endcap screen portion 144 transverse to the parallel spaced apart conductors or rungs 140.
  • the first screen portion 142 can be planar, smoothly curved, or contoured to approximately match contours of the head 118.
  • the endcap screen portion 144 provides a radio frequency reference ground so that the coil 120 is less perturbed by cable waves. The endcap screen portion 144 also reduces radiative energy losses and reflects radio frequency energy back into the imaging region.
  • the birdcage section can be shielded by a transparent or translucent radio frequency screen with openings between the rungs 140 to provide visibility for the subject 118. (This arrangement is similar to the radio frequency coil shown in FIGURE 13, discussed infra).
  • a birdcage screen is provided (not shown) that includes rungs similar to the rungs 140 but at a larger spacing from the head 118.
  • the birdcage screen can be resonant or non-resonant.
  • the coil 120 can also be used as a volume coil in which the top and bottom sections 122, 124 are connected by impedance networks.
  • a head coil 120' similar to the head coil 120 of FIGURE 11 is shown.
  • the coil 120' differs from the coil 120 in that a modified TEM section 124' has a modified endcap screen portion 144' that also serves as an end member for interconnecting parallel spaced apart conductors or rungs 130' of a modified birdcage section 122'.
  • the rungs 130' are connected with the endcap screen portion 144' by capacitances C s .
  • a radio frequency coil 150 is shown in a "rolled out" or planar view in which the generally cylindrical coil is unrolled and laid out flat for illustrative purposes.
  • the coil 150 includes a plurality of conductors or rungs 152 each having a capacitance C R formed using stripline technology on printed circuit boards or another suitable substrate.
  • Top , and bottom transverse end members 154, 156 are similarly formed and include capacitances Cr.
  • the capacitances C R and C ⁇ can be lumped discrete components, distributed components, or some combination thereof.
  • the end members 154, 156 appear linear in the "rolled out" view of FIGURE 13, the end members 154, 156 are actually rings arranged transverse to the rungs 152.
  • the conductors or rungs 152 and the end. member rings 154, 156 are disposed on a TEM radio frequency screen 158 that substantially reduces radiative energy losses.
  • the TEM radio frequency screen 158 defines a cylinder.
  • Transparent or translucent dielectric material 160 is disposed in openings of the radio frequency screen 158 between the conductors 152 and between the cross members 154, 156. In one embodiment the dielectric material 160 is air.
  • the transparent or translucent dielectric material 160 provides improved visibility for a human imaging subject, while the TEM radio frequency screen 158 supports a resonance mode resonating at least between the conductors 152 and the TEM radio frequency screen 158 to improve radio frequency characteristics of the coil 150.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

L'invention concerne un bobinage haute fréquence (30, 30', 120, 120') destiné à un système d'imagerie par résonance magnétique (10, 10') et comportant une section de type cage d'oiseaux (34, 122, 122') possédant une pluralité de conducteurs parallèles et espacés (46, 130, 130') et un ou plusieurs conducteurs transversaux ou terminaux (48, 132, 144', 154, 156) alignés généralement transversalement par rapport aux conducteurs espacés (46, 130, 130'), et une section de type transverse électromagnétique (32, 32', 32', 124, 124') comprenant une pluralité de conducteurs parallèles et espacés (40, 40', 140) et un blindage haute fréquence (42, 142, 144, 144'). La section de type cage d'oiseaux (34, 122, 122') et la section de type transverse électromagnétique (32, 32', 32', 124, 124') résonnent respectivement à une fréquence de résonance de cage d'oiseaux et à une fréquence de résonance de bobinage transverse électromagnétique. La section de type cage d'oiseaux (34, 122,122') et la section de type transverse électromagnétique (32, 32', 32', 124, 124') sont disposées l'une par rapport à l'autre avec les conducteurs parallèles et espacés de chaque section alignés et définissent une région de réception du sujet.
PCT/IB2004/052290 2003-11-18 2004-11-03 Bobinage hybride transverse electromagnetique/cage d'oiseaux pour irm Ceased WO2005050237A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2006540676A JP2007511315A (ja) 2003-11-18 2004-11-03 Ｍｒｉ用のハイブリッドｔｅｍ／バードケージコイル
EP04799055A EP1687651A1 (fr) 2003-11-18 2004-11-03 Bobinage hybride transverse electromagnetique/cage d'oiseaux pour irm
US10/595,861 US7345481B2 (en) 2003-11-18 2004-11-03 Hybrid TEM/birdcage coil for MRI

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52088003P 2003-11-18 2003-11-18
US60/520,880 2003-11-18

Publications (1)

Publication Number Publication Date
WO2005050237A1 true WO2005050237A1 (fr) 2005-06-02

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PCT/IB2004/052290 Ceased WO2005050237A1 (fr) 2003-11-18 2004-11-03 Bobinage hybride transverse electromagnetique/cage d'oiseaux pour irm

Country Status (5)

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US (1) US7345481B2 (fr)
EP (1) EP1687651A1 (fr)
JP (1) JP2007511315A (fr)
CN (1) CN100578250C (fr)
WO (1) WO2005050237A1 (fr)

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WO2006090293A3 (fr) * 2005-01-24 2006-12-07 Koninkl Philips Electronics Nv Bobine orthogonale destinee a l'imagerie par resonance magnetique
WO2006134557A1 (fr) 2005-06-16 2006-12-21 Koninklijke Philips Electronics, N.V. Antenne de volume rf a champ de vision selectif
DE102006052217A1 (de) * 2006-11-06 2008-05-08 Siemens Ag Magnetresonanzanlage mit Empfangsantenneneinrichtung
DE102006050105A1 (de) * 2006-10-24 2008-05-08 Siemens Ag Magnetresonanzanlage mit kreisförmigem Gradientensystem und nicht kreisförmiger Ganzkörperspule
WO2010018535A1 (fr) * 2008-08-14 2010-02-18 Koninklijke Philips Electronics N.V. Réseau de bobines tem à émission rf multicanaux (multix) doté d’un découplage de ligne microruban inductive n’émettant aucune onde radio électrique
CN116683202A (zh) * 2023-07-21 2023-09-01 广东博纬通信科技有限公司 一种多波束阵列天线

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DE102006018158A1 (de) * 2006-04-19 2007-10-25 Siemens Ag Zylindrische Magnetresonanzantenne
US20080157770A1 (en) * 2006-12-28 2008-07-03 Rf Sensors, Llc Dual-tuned tem/birdcage hybrid volume coil for human brain and spectroscopy
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CN101498771B (zh) * 2008-01-29 2011-12-07 西门子（中国）有限公司 磁共振成像系统的分离式线圈
US8035384B2 (en) * 2008-10-23 2011-10-11 General Electric Company Hybrid birdcage-TEM radio frequency (RF) coil for multinuclear MRI/MRS
US20100141260A1 (en) * 2008-12-05 2010-06-10 Schleifring Und Apparatebau Gmbh RF Coils for Magnetic Resonance Tomography
JP5384171B2 (ja) * 2009-04-02 2014-01-08 株式会社日立メディコ アンテナ装置及び磁気共鳴検査装置
CN103026251B (zh) 2010-05-27 2016-05-11 皇家飞利浦电子股份有限公司 Mri rf线圈阵列的多个通道的解耦
DE102010025919A1 (de) * 2010-07-02 2012-01-05 Siemens Aktiengesellschaft Spule; D-Form
JP5248557B2 (ja) 2010-07-29 2013-07-31 ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー 磁気共鳴イメージング装置
JP5685476B2 (ja) * 2011-04-11 2015-03-18 株式会社日立製作所 磁気共鳴イメージング装置
JP5968318B2 (ja) * 2011-07-30 2016-08-10 株式会社日立製作所 バードケージ型高周波コイル及び磁気共鳴イメージング装置
US10324145B2 (en) * 2011-10-10 2019-06-18 Koninklijke Philips N.V. Transverse-electromagnetic (TEM) radio-frequency coil for magnetic resonance
WO2013165470A1 (fr) * 2012-04-30 2013-11-07 Cincinnati Children's Hospital Medical Center Bobine radiofréquence (rf) de réduction de bruit acoustique pour imagerie à résonance magnétique
EP2672286A1 (fr) * 2012-06-05 2013-12-11 Koninklijke Philips N.V. Système de résonateur TEM destiné notamment à être utilisé dans un système IRM
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US20070079253A1 (en) 2007-04-05
US7345481B2 (en) 2008-03-18
EP1687651A1 (fr) 2006-08-09

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